For decades now, serial killers have taken center stage in the news and entertainment media. The coverage of real-life murderers such as Ted Bundy and Jeffrey Dahmer has transformed them into ghoulish celebrities. Similarly, the popularity of fictional characters such as Hannibal "The Cannibal" Lecter or Dexter demonstrates just how eager the public is to be frightened by these human predators.

But why is this so? Could it be that some of us have a gruesome fascination with serial killers for the same reasons we might morbidly stare at a catastrophic automobile accident? Or it is...